During her time there, Joanna re-positioned Bebo as a social content portal, instead of a social network. This made it more attractive to ad agencies and old media companies that could buy Bebo.

Meanwhile, Bebo's userbase doubled in size.

The strategy worked, and Joanna sold the site to Time Warner's (TWX) online subsidiary AOL for $850 million in cash. Bebo's founders Michael and Xochi Birch -- the people who hired Joanna to do a job -- walk away with something close to $595 million from the deal.

Joanna joined AOL with the acquisition and, a year later, got the hell out.